These conundrums are irrelevant anyway. Over one million people die every year on the roads. The instant AI becomes better than humans, it's a moral imperative to adopt it, no matter what it does in these rare and contrived circumstances.
If this is your motivation then you will want the car to always default to saving the driver over pedestrian. To do otherwise would discourage adoption.
Not sure i'm so comfortable with this; it will result in a number of people killed who never accepted this risk and might have been safe. In order to save a number of people who accepted risk in the first place.
These decisions seem unavoidable.